描述
由于系统程序及工作数据与用户无直接联系,所以在PLC产品样本或使用手册中所列存储器的形式及容量是指用户程序存储器。当PLC提供的用户存储器容量不够用,许多PLC还提供有存储器扩展功能。
存储器主要有两种:一种是可读/写操作的随机存储器RAM,另一种是只读存储器或可擦除可编程的只读存储器ROM、PROM、EPROM和EEPROM。
Shimadzu HPLC cooler cooling unit sample
Gilson Pipetman Pipette Pipettor set pipet variable 6
PE perkin Elmer cycler PCR system GeneAmp 2400 gene amp
Precision Sci waterbath shaker reciprocal shaking bath
savant gel vacuum pump diaphragm GEP140
Nikon Microflex AFX-DX Camera Microscope control box
LKB multitemp recirculating water bath circulator 2219
Ludlum 3 survey meter geiger counter radiometer
Jones Chromatography HPLC column heater chiller 7950
VWR Symphony pH meter electrode combination SB301
tektronix oscilloscope 7613 differential amplifier 7A22
Gilson HPLC LC injection valve actuator Rheodyne 7060
Gilson HPLC LC injection valve actuator Rheodyne 5012